Method of and apparatus for making extruded products



Aug. 24, 1937. B STEWART 2,091,124

METHOD OF AND APPARATUS FOR MAKING EXTRUDED PRODUCTS INVENTOR B urns F Ste wart BY M ATTORN EY Aug. 24, 1937. B. A. STEWART METHOD OF AND APPARATUS FOR MAKING EXTRUDED PRODUCTS Filed Aug. 9, 1929 2 Sheets-Sheet 2 .FIII v INVENTOR Burn-s xs warl- B/Yg,

ATTORNEY Patented Aug. 24, 1937 UNITED STATES METHOD or AND APPARATUS FOR MAKING EXTRUDED PRODUCTS Burns A. Stewart, Nutley, N. J., assignor, by mesne assignments, to The Patent and Licensing Corporation, New York, N. Y., a tion of Massachusetts corpora-L Application August 9, 1929, Serial No. 384,735

12 Claims.

This invention relates to improvements in mechanism for the manufacture of extruded products and more particularly to mechanism for extruding plastic waterproofing compositions,

5 such for example as mixtures of bituminous material combined with fibres and other fillers.

-The invention is particularly concerned with the production of boardlike structures composed of a central ply or membrane of sheet fibrous material, and adherent outer layers of mastic material composed of mixtures of bitumen, fibre, and fillers.

The primary object of the invention is toprovide a, mechanism for bringing together in proper relationship, the mastic material in the form of extruded sheets of predetermined thickness and cross-section, with the fibrous sheet forming the central ply or membrane.

Another object of the invention resides in the construction of an extruding head for extruding plastic mixtures of bitumen, fibers and fillers whereby to form simultaneously spaced separate sheets of mastic material, between which the fibrous sheet composing the central ply may be continuously supplied.

Still another object of the invention is the provision of means for adjusting the quantity of 1 plastic material forced through the separate portions of the extruding head for theformation of the two separate mastic sheets.

In the drawings,

Figure 1 is a side elevation of apparatus embodying my invention.

Figure 2 is a plan view of part of the mechanism shown in Figure 1.

Figure 3 is a view in elevation of the rear end of the extruding head, constructed according to my invention.

Figure 4 is a similar view of the forward end 40 thereof.

Figure 5 is a longitudinal cross-section through the extruding head.

Figure 6 is a view partially in plan and partially in horizontal cross-section through the 45 extruding head, and

Figure 7 is a fragmentary view of the product as produced by the apparatus shown in Figures The invention is particularly concerned, as 5 heretofore stated, with the formation of extruded sheets composed of suitable mixtures of bituminous material, fibre and fillers, and for this purpose the bituminous material consists preferably of asphalt of 140 to 280 F. melting point and 55 this asphalt is combined with rag, news or other preciated by those skilled in these fields...

For suchuses as expansion joints and the like, the plastic mass which is to be extruded in accordance with my invention may consist of disintegrated and plasticized scrap asphalt prepared roofing of which considerable quantities are available in the roofing industry. This roofing scrap may be formed into a homogeneous plastic mass in any conventional form of kneading or masticating machine, compounded if desired with additional quantities of asphalt to impart the desired consistency thereto.

The plastic mass to be.extruded in the manner hereinafter to be more fully described, may be supplied from any convenient source to the extruding device constructed in accordance with the invention. This extruding device is vindicated as a whole in the drawings by the numeral Ill, and consists of a feed chamber H, provided with a screw conveyor to force the plastic material under pressure'into and through the extruding head proper, indicated at l2.

The extruding head I2 is formed in accordance with my invention in two halves, consistingof an upper hollow semi-frustro-conical section l3 and a similar hollowsemi-frustro-conical section l4. These separate sections may be secured to each other through bolted flanges l and to the forward end of the feed chamber H as by means of bolts passing through openings in a flange plate It formed at the rear end of each section.

The forward ends of the sections I3, l4- merge into r tally l ngated mouths or openings ll, l8 respectively, extending crosswise of the sections between the outer walls thereof and arcuate Walls 0; 2|. .These openings ll, l8 may themselves serve as the extruding dies, but generally ey are fitted with separate dies of desired size and cross-section. In this way, two spaced extruding nozzles l1 and I8 are provided, between which there is a semi-cylindrical recess 22 for a purpose as will presently appear. The Walls of the nozzle l1 and I8 adjacent the mouth thereof, are preferably hollowed out as shown at 23, and 24, to provide jackets through which a temperature regulating medium such as steam or hot water may be circulated, as by means of 5 pipe connections 23a, 24a respectively, whereby the proper temperature conducive to smooth extrusion is afforded. In order to cause the plastic material forced into'and through the extruding head l2 from the feed chamber H to be spread and distributed laterally through the extruding head, a spreading i device 25 may be secured to the lower section l4 as by means of screws 26 passing therethrough and into threaded openings formed in the spreading device 25.. The spreader 25 is provided with inclined faces 21 and 28 designed to cause the plastic material to be spread laterally in its passage through the extruding head. Provision is also made for adjusting the flow of the plastic material through the nozzles l1 and I8. Manifestly the plastic material passing through the frustro-conical portion of the extruding head will normally tend to flow through the lower discharge nozzle l8, but in order to cause a suificient quantity thereof continually to pass upwardly and be forced through the upper nozzle I1, I provide a triangular choke device 30, formed with a surface opposite the apex 3|, concentric with the arcuate'walls 20, 2| of the 30 separate sections l3, l4. This arcuate face of the choke device 30 is provided with a series of threaded openings adapted to receive a bolt 33 passing through an opening in one of the walls 20, 2|, whereby the choke device may be 35 secured in any one of several positions around the inner face of the walls 20, 2|. According to the position of the choke device 30 around the inner face of the walls 20, 2|, the plastic material passing through the extruding head may be caused to take either a downward or an upward course, but preferably, the choked device is adjusted to permit passage of the plastic material to both the upper and lower discharge nozzles l1, I8 in regulated quantities to insurecontinuous extrusion of two sheets of the plastic material. i

The extruding device with the extruding head constructed as heretofore described, will be mounted, in operation, adjacent one end of an endless conveyor belt 40 passing around pulleys 4|, Ma, and guide rolls 42, so that the sheet of plastic material 43 extruded through the lower discharge nozzle l8 will be received by and carried forwardly upon the conveyor belt 40, the latter being supplied if desired with a soap solution or other nonadhesive material to prevent sticking of the plastic sheet thereto. In the recess 22 formed between the upper and lower discharge nozzles I 1 and [8 there is mounted a supply roll 44 of fibrous sheet material com- 4| and a cooperating pulley 46 which press the whole together and assist in drawing the same forwardly. The sheet as thus finished is illustrated fragmentarily and in Figure '7, may then 75 pass through suitable cutting mechanis .501

separating the same intosections or units of desired size and shape.

I claim as my invention:

1. In the art of manufacturing waterproof extruded products, the improvement which comprises forcing a plastic mass composed of bitumen, fibre and filler, through two spaced extruding nozzles whereby to discharge two continuous sheets of the plastic material, of predetermined cross-section, delivering one of said sheets upon one faceof a forwardly moving felted fibrous sheet and subsequently combining the other extruded sheet with the opposite face of said felted fibrous sheet.

2. The method which comprises forcing a ho- 1 mogeneous plastic mass of bitumen, fibre and filler under pressure through spaced openings of predetermined cross-section whereby to discharge two spaced sheets of plastic material, feeding a web of fibrous material intermediate said sheets and carrying one of .the sheets forwardly on said web, and subsequently combining the other of said plastic sheets with the opposite face of said web.

3. The method of simultaneously forming a plurality of sheets of plastic bituminous material, which comprises, feeding a mass of material to a chamber having a plurality of discharge openings, spreading said mass laterally in said chamber and forcing the mass through said openings to form a plurality of continuous sheets.

4. The method which comprises, feeding a plastic mass to a chamber having discharge openings therein, forcing said mass through the chamber and causing the mass to be distributed therein to form a plurality of sheets, feeding a web of material intermediate said sheets and subsequently combining the upper face ofone sheet and the lower face of the othersheet with said intermediate web.

5. The method which comprises simultaneously feeding a plastic mass to a chamber having disv charge openings therein, spreading said mass laterally in said chamber, forcing the mass through a plurality of openings to form a plurality of continuous sheets, feeding a web of material intermediate of said sheets and subsequently combining the upper face of one sheet and the lower 'face of the other sheet with said intermediate web.

6. The method of' simultaneously forming a plurality of sheets of plastic bituminous material which comprises, feeding a plastic mass to a chamber having a plurality of discharge openings, forcing said mass through the chamber and spreading it vertically therein to form a plurality of widely spaced sheets.

7. The method of simultaneously forming a plurality of sheets. of plastic material which comprises, feeding a plastic mass to a chamber having a plurality of openings, forcing said mass through said chamber and openings to obtain a plurality of sheets of predetermined cross-section and spreading the mass both vertically and laterally as it is forced through the chamber.

8. In the art of manufacturing waterproof extruded products, the improvement which comprises forcing a plastic mass of bitumen, fiber and filler, under pressure; through a chamber and extruding the same therefrom in the form of a plurality of spaced sheets of predetermined 1 cross-section, feeding a web of fibrous material intermediate said'sheets, and consolidating said.

sheets with said web.

9. In the art of manufacturing waterproof extruded products, the improvement which comextruded products, the improvement which comprises forcing a plastic mass of bitumen, fiber and prises forcing a bituminous plastic mass through fi e U d P s t o a c ber a two spaced extruding nozzles whereby to disx ru n he sametherefrom in the form of two charge two continuous sheets of the plastic mate- 5 p d sheets of predet rmined cross-secti n, rial, delivering one of said sheets upon one face 5 feeding a Web of fibrous material intermediate of a forwardly moving fibrous sheet and subsesaid sheets, and consolidating both said sheets quently cmbining the other extruded sheet with with said web therebetween. the opposite face of said fibrous sheet.

10. In the art of manufacturing waterproof 12. In, the art of manufacturing waterproof 10 extruded products the improvement which comtruded products, the improvement which com- 10 prises forcing a plastic mess of bitumen, fiber prises forcing a bituminous plastic mass through and filler, under pressure, through a chamber a chamber and extruding the same therefrom in and extruding the same therefr-Pm m the of the form of two spaced sheets of predetermined two spaced Sheets of predetemuned cross sectmn cross section, feeding a web of fibrous material r i t v I 10 5222 Ea i g? if g m gfi gfi gzgz ig intermediate said extruded sheets, bringing said he same w b to ether and sub ectin the same to ressure Sheets and together and SuhJectmg t to coniolidate the sheets with the wet: thereto Pressure to cohsOhdate the Sheets with t between, web therebetween.

20 11. In the art of manufacturing waterproof BURNS A. STE WART. 20 

